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"supremacy" is also used as a crossword clue. If that's what you saw, the answer is often hegemony (8 letters).
Definitions
power to dominate or defeat
Word origin
From supreme + -acy (a variant of -cy). Compare with supremity and New Latin suprematia.
Used in a sentence
“white supremacy”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Dominance”9 letters
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